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The battery charges whenever the computer is plugged into external power through an AC adapter, an
optional power adapter, an optional expansion product, or an optional docking device.
The battery charges whether the computer is off or in use, but it charges faster when the computer is
off.
Charging might take longer if a battery is new, has been unused for two weeks or more, or is much
warmer or cooler than room temperature.
To prolong battery life and optimize the accuracy of battery charge displays:
●
If charging a new battery, charge it fully before turning on the computer.
●
Allow the battery to discharge below five percent of a full charge through normal use before
charging it.
●
If the battery has been unused for one month or more, calibrate the battery instead of simply
charging it.
Maximizing battery discharge time
Battery discharge time varies depending on the features used while on battery power. Maximum
discharge time gradually shortens, as the battery storage capacity naturally degrades.
To maximize battery discharge time:
●
Lower the brightness on the display.
●
Check the Power saver setting in Power Options.
●
Remove the battery from the computer when it is not being used or charged.
●
Store the battery in a cool, dry location.
Managing low battery levels
The information in this section describes the alerts and system responses set at the factory. Some low-
battery alerts and system responses can be changed using Power Options in Windows Control Panel.
Preferences set using Power Options do not affect lights.
Identifying low battery levels
If a low battery level is not resolved, the computer enters a critical battery level.
The computer takes the following actions for a critical battery level:
●
If Hibernation is enabled and the computer is on or in Sleep, the computer initiates Hibernation.
●
If Hibernation is disabled and the computer is on or in Sleep, the computer remains briefly in Sleep,
and then shuts down and loses any unsaved information.
Resolving a low battery level
CAUTION: To reduce the risk of losing information when the computer reaches a critical battery level
and has initiated Hibernation, do not restore power until the power lights turn off.
42 Chapter 5 Power management